Illegally LOUD Motor Vehicles: Forced Compliance – Methodology?

Though regulated Federally to a relatively quiet 80dB(A) via the Code of Federal Regulations, Title 40 CFR, LOUD motor vehicle noise abuse is pervasive throughout the United States. What can be done to force/coerce State and Local administrations and enforcement entities to STOP the vehicular noise that destroys human health and welfare, destroys daily quality of life, bullies our most innocent in society?